Monty,
Carbon is old-speak, most are going for Tracys' ceramic seals. The take a while to break in, but seem to last very well. Rotor housing wear hasn't been a problem for anyone not using a 100,000 mile motor to start with. Ed Anderson ran into some trouble with ROTOR tip seal slot wear, check yours carefully. I defer to Tracy, Ed and Lynn as to the corner seals, nobody I know has really worn out a motor. (including racers in sedan classes!)
Bill Jepson
-----Original Message-----
From: Monty Roberts <montyr2157@alltel.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Wed, 28 Dec 2005 16:11:16 -0600
Subject: [FlyRotary] carbon seals?
Has anybody out there got any experience with the carbon apex seals? Mostly I wonder what the service interval is for them. It would seem to be preferable to replace the seals and not have to deal with rotor housing wear.
When do the single piece corner seals become preferable (if ever)?
Monty